Merge pull request #9358 from atmire/atmire-hierarchical-vocabulary-preloadLevel-config-fix-main

PreloadLevel config vocabulary issue

dspace-api/src/main/java/org/dspace/content/authority/DSpaceControlledVocabulary.java

@@ -224,6 +224,7 @@ public class DSpaceControlledVocabulary extends SelfNamedPlugin implements Hiera
 
     @Override
     public boolean isHierarchical() {
+        init();
         return true;
     }
 
@@ -256,6 +257,7 @@ public class DSpaceControlledVocabulary extends SelfNamedPlugin implements Hiera
 
     @Override
     public Integer getPreloadLevel() {
+        init();
         return preloadLevel;
     }